Research suggests that teachers who personalize their teaching through the use of humor, stories, enthusiasm, and self-disclosure are perceived by their students to be effective in explaining course content. This experimental study examined the effects of computer-mediated teacher self-disclosure on perceptions of teacher credibility. Participants who accessed the "Facebook" website of a teacher high in self-disclosure reported higher levels of teacher credibility than participants who viewed a low self-disclosure "Facebook" website. Implications for classroom pedagogy, technology use, and areas for future research are discussed. (Contains 2 tables and 1 note.)